Improved ventilator



NTTE STATES PATENT Tricia PETER LEAR, OF MEDFOBD,MAS'SACHU SETTS.

IMPROVED VENTILATOR.

To all whom, it may concern.-

Be it known that I, PETER LEAR, of Medford, in the county of Middlesexand State of Massachusetts, have invented a new and useful Ventilatorfor Chimneys or Air-Flues; and I do hereby declare the same to be fullydescribed in the following specification and represented in theaccompanying drawings, of which Figure 1 is a side elevation, and Fig. 2a vertical section, of it. Fig. 3 is a horizontal section taken throughthe impelling-wheel of the ventilator. Fig. 4. is a horizontal sectiontaken between the covering-cap and the conical case, and so as toexhibit the current deflector and the radial wings or flanges of thesaid case.

In such drawings, A denotes a vertical pipe or conduit passing upwardconcentrically through and being fixed to a wind-wheel or propeller, B,but having no passage leading into the same. The tube A is open both attop and bottom, and at its upper end leads into and is surmounted by aninverted conical case, D, having within it and projecting from its sidesa series of wings or flanges, b b b, arranged radially. A circularplate, E, rests on and is fixed to the upper ends or parts of theflanges, and is arranged with respect to such flanges in manner as shownin Figs. 2 and 4. viz., so that there may be openings 0 0 between thesaid plate, the case D, and the upper parts of the several wings. Theplate E serves as a deflector to facilitate the passage of smoke intothe spaces between the flanges when the apparatus may be in operation ontop of a chimney or flue. A weather cap or dome, F, surmounts the caseD, and is supported above it by means not only of sundry small rods orcolumns 0 c 0, but by a spindle, O, which extends from the said cap ordome down through the middle or axis of the venti lator, in manner asshown in Fig. 2.

When the apparatus is applied to the top of a chimney, the lower part ofthe tube A should enter or be arranged directly over a round hole madein a plate capping the chimney or flue, and the spindle should besuitably stepped and supported, so as to enable the ventilator to befreely revolved by a current of wind when blowing against any of the inthe chimney or flue.

buckets or wings a a of the wind-wheel or propeller B, from whateverpart of the compass the wind may be blowing. Under these circumstancesthe rotation of the ventilator will induce a current up the chimney orflue, such current serving to facilitate the passage of smoke or foulair up the chimney or flue and its discharge through the ventilator.lVhile the conical case D, with the radial flanges, deflectorplate, andweather cap or dome may be in revolution, the air at or about the axisof the said case will, by the centrifugal force generated within it, bethrown outward toward the inner surface of the case, which, owing to itsconical form, will deflect the air upward toward the mouth or upper partof such case, from whence it may be ejected, the plate E operating atthe same time to aid in deflectin g the air and to afford support to theseveral flanges.

The weather-cap protects the open mouth of the case D from rain, snow,and downward drafts or currents of wind. On removal of the weather-capand inverting the ventilator it may be used to induce a downward currentIn this way it will be specially useful for supplying fresh air toapartments or places where such may be desirable.

1 do not herein claim the combination of a wind-wheel arranged on achimney with a screwpropeller disposed within the said chimney.

WVhat I claim as my invention is as follows,

VIZ:

1. The combination as well as the arrangement of the wind-wheel B, theconduit A, the inverted conical case D, and its series of radial flangesb b, the whole being applied to a spindle, O, substantially as and so asto operate as hereinbet'ore explained.

2. The combination as well as the arrangement of the wind-wheel B, theconduit A, the inverted conical case D, the series of radial flanges bb, and the deflector E, the whole being applied to a spindle, O,substantially as and so as to operate as hereinbefore specified.

3. The combination as well as the arrangement of the wind-wheel B, theconduit A, the inverted conical case D, the series of radial flanges bb, and the weather-cap F, the

whole being applied to a spindle, (J, substanthe Weather-cap F, thewhole bein g applied to a tiaily as and. so as to operate ashereinbefore spindle, G, substantially as and so as to operdesoribed.ate as hereinbefore set forth.

4. The combination as Well as the arrange- PETER LE AR. ment of thewind-wheel B, the conduit A, Witnesses: the inverted conioal'ca-se D,the series of ra- R. H. EDDY, dial flanges or wings I) b, the deflectorE, and F. 1?. HALE, J r.

